Grinding machine



April 4, 1939. H. N. NORMAN 2,153,476

GRINDING MACHINE I Filed March 17, 1938 2 Sheets-Sheet l 3" a7 94 35' 30 as :9 7/ Z INVENTOR m flaj mw.

- ATTORNEYS April 1939- I H. N. NQRMAN 7 2,153,476

GRINDING MACHINE Filed March 17, 1938 2 Sheets-Sheet 2 r/ INVENTOR ATTORNEYS Patented Apr. 4, 1939 UNITED STATES PATENT OFFICE GRINDING MACHINE Hallett Nickle Norman, Rockville, Conn. Application March 17, 1938, Serial No. 196,512

3 Claims.

The invention relates to a grinding .machine and more especially to a blade grinder.

The primary object of the invention is .the provision of a machine of this character, wherein a work holder is in the form of a vise adaptable for clamping the blade of shears, the blade of a knife or the like and is susceptible of variable adjustment for the feeding of the cutting edge of the blade to the grinder wheel for the sharpening of such edge in the working of the grinder.

Another object of the invention is the provision of a machine of this character, wherein the vise for the clamping of work is upon a carriage susceptible of being shifted in a support for the feeding of the work crosswise of the grinding element and such vise will properly hold the work to the grinding element during the shifting of such work in the sharpening of the same.

A further object of the invention is the provi- 20 sion of a machine of this character, wherein the work holder is of novel construction and is adaptable for different sizes of work.

A still further object of the invention is the provision of a machine of this character, which is simple in its construction, thoroughly reliable and eificient in operation, readily and easily adjusted for the positioning of the work to the grinding element and inexpensive to manufacture.

With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a fragmentary side elevation partly in section of the machine constructed in accordance with the invention.

Figure 2 is a plan view thereof.

Figure 3 is a fragmentary front elevation.

Figure 4 is a detail sectional View on the line 44 of Figure 3.

Figure 5 is an elevation of the work holder rack.

Figure 6 is an end elevation of the vise and partly broken away.

Figure 7 is a fragmentary elevation of one end portion of the vise.

Figure 8 is a fragmentary end elevation of the rack showing the release for the carriage operating therein.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring to the drawings in detail, A designates generally a portion of a stand top or other support included in the frame (not shown) of the grinding machine constructed in accordance with the invention and hereinafter fully described.

This top or other support A has provided therein a dovetail shaped slot l0 disposed in the direction of a rotary grinding wheel, a portion thereof being indicated at H, the slot I0 being disposed to open through the front edge of the top or support A and accommodates therein a companion dovetail rib l2 at the bottom of a substantially U-shaped rack I3 while the said rib l2 has associated therewith a nut-carrying binding screw I4 fastening the rib l2 in the slot Ill after adjustment of the rack 13 with relation to the top or support A. The rack 13 has slidably fitted therein a carriage l5 having trackage in opposed walls [6 of said rack [3 for travel in a horizontal plane. J ournaled transversely of the rack I3 is a turning axle l1 fitted with a rack gear 18 meshing with rack teeth l9 provided at the under side of the carriage I5, the axle I! being also fitted with a hand crank 20 for manual turning thereof. The meshing engagement of the rack gear I 8 with the rack teeth IS on the turning of the axle l'l feeds the carriage l5 and is adaptable to be moved in reverse directions at the will of the operator of the machine.

The carriage I5 at one end thereof .carries a turnable latch 2| so that such carriage can be conveniently removed from the rack l3, being releasable only from one end of said rack, being an abutment 22 at the other end of said carriage remote from the latch 2|, which stalls removal of the carriage from the rack through the other end of said rack.

Formed on the carriage H5 at opposite ends thereof are upstanding bearings 23 accommodating pivot ends 24 of a rocking bar 25, being square in cross section between said ends 24. This bar 25 has fitted thereto the squared eye terminal 26 of an arm 21 adapted for adjustment longitudinally of the bar and held in a fixed position by a set screw 23 engaging therewith and threaded into the eye 26. The arm 21 for a major portion of its length is provided with a longitudinally extended slot 29 accommodating a nut-carrying set screw 30 fitted in a hanger stem 3| of a work vise including relatively long stationary and movable jaws 32 and 33, respectively. The movable jaw 33 swings upon a pivot 34 fitting the extension 35 therefrom and the stem 3| so that said jaw 33 can be brought toward and away from the stationary jaw 32 of the device in the use thereof.

'32 against the resistance of the spring 36. These jaws when in clamping position firmly grip and hold a piece of work, for example, the blade 39 of shears, scissors or the like or a knife blade or the like, for the setting of such blade 39 with respect to the grinding element l I for the sharpening of the beveled cutting edge 40 of such blade. The stationary jaw 32 carries a clip M which accommodates the other blade 42 of the shears, scissors or the like in pivotal association with the blade 39 for the holding of this blade 42 against swinging movement when the blade 39' is acted upon by the grinding element l l for the sharpening thereof.

Connected with one of the bearings 23 on the carriage l and the bar is a coiled tensioning spring 43 which is coiled about the said bar 25 and operates or functions to hold the vise in approaching relation to the grinding element to assure the contact of the work with the latter for grinding purposes.

The carriage l5 at one end thereof has fitted therewith an adjusting stop 44 coacting with the rack l3 to limit the movement of the said carriage in one direction or in a direction to avoid the contact of the blade 42 with the grinding element II when this blade is in the clip 4| and thus avoids damage to such blade which necessarily would result by its contact with the grinding element when the said blade is not in a position for the sharpening thereof.

The stationary jaw 32 has thereon adjustable gauges 45, these serving to hold the blade of the work properly set in the vise for the projecting of the-edge of such blade to be sharpened by the grinding element II when the machine is operated. These gauges 45 hold the blade or Work accurately set in the vise for true sharpening operation in theworking of the machine.

On the rack 13 in the vertical path of movement of the arm 21 is a rest rail 46 which is of the required length and serves as a tool rest or tool support rest in the use of the grinding machine.

What is claimed is: g

l. A machine of the character described comprising a support, a member carried by the support and having a track, a carriage movably engaging the said track, means for adjusting the member on the support in a direction at substantially right angles to the movement of the carriage, a rocking bar having pivotal connection in the carriage for movement on a horizontal axis and being flat faced, an arm slidably fitted on the flat-faced portion of said rocking bar, a tool holder adjustably engaged with said arm and having a vertical swing and adjustment longitudinally of said arm, means for securing the arm in adjusted position on the rocking bar,

means for tensioning the rocking bar for urging the same for rocking movement in one direction, and means associated with said member and carriage for imparting movement to the latter.

2. A machine of the character described comprising a support, a member carried by the support and having a track, a carriage movably engaging the said track, means for adjusting the member on the support in a direction at substantially right angles to the movement of the carriage, a rocking bar having pivotal connection in the carriage for movement on a horizontal axis and being flat faced, an arm slidably fitted on the flat-faced portion of said rocking bar, a tool holder adjustably engaged with said arm and having a vertical swing and adjustment longitudinally of said arm, means for securing the arm in adjusted position on the rocking bar, means for tensioning the rocking bar for urging the same for rocking movement in one direction, means associated with said member and carriage for imparting movement to the latter, and a rest associated with said'member.

3. A machine of the character described comprising a support, a member carried by the support and having a track, a carriage movably engaging the said track, means for adjusting the member on the support in a direction at substantially right angles to the movement of the carriage, a rocking bar having pivotal connection in the carriage for movement on a horizontal axis and being flat faced, an arm slidably fitted on the fiat-faced portion of said rocking bar, a tool holder adjustably engaged with said arm and having a vertical swing and adjustment longitudinally of said arm, means for securing the arm in adjusted position on the rocking bar, means for tensioning the rocking bar for urging the same for rocking movement in one direction, means associated with said member and carriage for imparting movement to the latter, a rest associated with said member, and an adjustable stop on the carriage and coacting with the member limiting the throw of the carriage in one direction.

HALLETT NICKLE NORMAN. 

